“Every plant is native to someplace, but that place may not be here." 1:00 pm, Apr. 30, 2021 × Gardeners interested in growing native wildflowers that are beneficial to pollinators are advised to purchase native seed mixes from local plant sellers. (Photo by Debi Nitka, courtesy Minnesota DNR) It’s time to start planting, but take care of the seeds you use. Local invasive species experts advise that several packets advertising wildflower mixes may come with destructive non-native plants or noxious weeds. A University of Washington study found out of 19 seed packets, three to 13 contained invasive species, and eight had seeds for plants considered noxious weeds in at least one U.S. state or Canadian province.